Table V. Surface Milling Of Cast Iron

Diameter of Mill

(in.)

Revolutions per Minute

Speed of

Cutter per Minute

(ft.)

Depth of Cut

(in.)

Width of Cut

(in.)

Feed per Minute

In Scale of Cast

Iron

(in.)

Under

Scale of

Cast Iron

(in.)

3

42

34

1/16

1

6 5/8

8 7/8

42

34

1/2

1

4 1/8

6 1/2

42

34

1/16

2

6 5/8

8 7/8

42

34

1/2

2

2 1/2

4 1/8

42

34

1/16

3

6 5/8

8 7/8

42

34

7/16

3

1 3/8

2 3/16

3 1/2

42

40

5/32

8

4 1/8

6 1/4

42

40

1/8

3 1/2

2 1/2

31

4 1/2

42

50

1

2

4 1/8

6 1/2

42

50

1

4

3 1/2

4 1/8

42

50

1

6

2

2 1/4

42

50

1/8

6

4 1/8

6 1/2

42

50

11/32

12

1 3/8

2

Table VI. Surface Milling Of Soft Machinery Steel

Diameter of Mill

(in.)

Revolutions per Minute

Speed of

Cutter per Minute

(ft.)

Depth of Cut (in.)

Width of Cut

(in.)

Feed per Minute

In Scale of S.M.S.

(in.)

Under Scale of

S.M.S. (in.)

3

38

30

l/16

1

6

8

38

30

1/2

1

1 1/8

1 7/8

38

30

1/16

2

2 3/8

3 1/2

38

30

1/2

2

3/4

1 1/8

38

30

1/16

3

1 1/8

1 7/8

38

30

3/8

3

3/4

1 1/8

3 1/2

38

35

1/16

8

1 7/8

3

38

35

1/8

8

3/4

1 1/8

4 1/2

25

30

1/16

3

4

5

25

30

1/16

5

2 1/2

4 1/2

25

30

3/8

5

1/2

25

30

1/16

10

1 3/4

2 1/2

25

30

3/16

10

1/2

7/8

and feeds are those used when the milling cutters are made from a good grade of carbon tool steel. If the cutters used are made from the newer high-speed steels, these figures can be decidedly increased.